This sign-off video is from WDIV Channel 4 (‪@ClickOnDetroitLocal4WDIV‬), Detroit's NBC Station. First up is the closing seconds of Classroom, presumably a WDIV public affairs featurette. Next is the display of the NAB TV Code Seal, the 1979-83 design which would be the final one used by the NAB. After two quickie local PSAs comes an opposing reply to a recent WDIV editorial on the subject of mandatory deposits on beer bottles, delivered by Pat Laughlin, president of the Michigan Beer and Wine Wholesalers Association. The station sign-off announcement follows, with mention of ownership, studio location, and copyright info. Then it's two more quick local PSA, and afterward comes a one-and-a-half-minute inspirational message from Rabbi Daniel Schwartz of the Temple Beth El. Following this comes the Moog Synthesizer version of the SSB film that was also used by other TV stations in the United States. The video concludes with a black-and-white test pattern with tone.
P.S. Although the video is originally from retroontario.com, I retrieved the sign-off clip from the closed TV-Signoffs.com. Credits to‪@Retrontario‬
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